7SR11 & 7SR12 Description Of Operation
Chapter 1 Page 58 of 88 ©2017 Siemens Protection Devices Limited
3.16 Power Protection: Power (32) – 7SR12
Two under/over power elements are provided and can measure real, reactive or apparent power.
Gn 32-n Setting sets the pick-up power level for the element.
Under-power or over-power operation can be set by the Gn 32-n Operation setting.
Gn 32-n 1ph/3ph Power allows the settings to be based on any one phase exceeding the power pick up level or
on the total power of all three phases.
An output is given after elapse of the Gn 32-n Delay setting.
Operation of the under/over power elements can be inhibited when:
The measured current is below the Gn 32-n U/C Guard setting
A VT Fail condition is detected
Inhibit 32-n A binary or virtual input.
V
1
I
L1
V
2
V
3
I
L3
I
L2
&
Enabled
Enabled
<
&
<
<
&
En.
Inhibit
VT Fail
&
+W
-VAr
-W
-VAr
-W
+VAr
+W
+VAr
Gn32: Operation: Under/Over
Gn 32-n U/C Guard
Setting
Gn 32-n Delay
Gn32: 1ph/3ph Power
Gn32: Power: P, Q, R
Gn32: Direction
Gn32: Setting
Gn 32-n U/C
Guarded
Gn 32-n VTS
Action
Gn 32-n Element
32-n
General Pickup
Inhibit 32-n
Figure 3-31 Logic Diagram: Power Protection (32)
To Next Page
Loading...
Need help?
General
